Code Definition

P1456 — Evaporative Emission canister small leak

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Infiniti

About P1456

P1456 is a manufacturer-specific powertrain diagnostic trouble code recorded for Infiniti vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1456 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC P1456 indicates a small leak detected on the fuel tank side of the evaporative emission control system on these Nissan and Infiniti vehicles. The EVAP system is split into a canister side and a tank side, with the tank side running from the EVAP two way valve to the fuel tank, and this code points specifically to a leak in that tank side portion. The Engine Control Module (ECM) finds the leak during its sealed system test when the tank side cannot hold the expected pressure or vacuum. The most common cause is a loose or faulty fuel filler cap, followed by leaks at the filler neck, the fuel...

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